7419 resource model expand collapse all

[vouidaskis]

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Description of Change

Add expand all and collapse all buttons to the top of the list much like the node tree in the graph designer.

Issues Solved

Closes #7419

Checklist

• I targeted one of these branches:
  • dev/8.0.x (under development): features, bugfixes not covered below
  • dev/7.6.x (main support): regressions, crashing bugs, security issues, major bugs in new features
  • dev/6.2.x (extended support): major security issues, data loss issues
• I added a changelog in arches/releases
• I submitted a PR to arches-docs (if appropriate)
• Unit tests pass locally with my changes
• I added tests that prove my fix is effective or that my feature works
• My test fails on the target branch

[chiatt]

Thanks for submitting this fix @vouidaskis. Could you add just a little space between the expand and collapse buttons?

They should look more consistent with the similar feature in the graph and card trees: